Fixed bug in cache controller that was causing session handler to return NoneType

lib/cachecontrol/adapter.py

@@ -2,13 +2,14 @@ from requests.adapters import HTTPAdapter
 
 from cachecontrol.controller import CacheController
 from cachecontrol.cache import DictCache
-
+from cachecontrol.session import CacheControlSession
 
 class CacheControlAdapter(HTTPAdapter):
     invalidating_methods = set(['PUT', 'DELETE'])
 
     def __init__(self, sess=None, cache=None, cache_etags=True, *args, **kw):
         super(CacheControlAdapter, self).__init__(*args, **kw)
+        self.sess = sess or CacheControlSession()
         self.cache = cache or DictCache()
         self.controller = CacheController(sess=sess, cache=cache, cache_etags=cache_etags)
 

lib/cachecontrol/controller.py

@@ -8,7 +8,7 @@ import datetime
 
 from cachecontrol.cache import DictCache
 from cachecontrol.compat import parsedate_tz
-
+from cachecontrol.session import CacheControlSession
 
 URI = re.compile(r"^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?")
 
@@ -28,7 +28,7 @@ class CacheController(object):
     def __init__(self, sess=None, cache=None, cache_etags=True):
         self.cache = cache or DictCache()
         self.cache_etags = cache_etags
-        self.sess = sess
+        self.sess = sess or CacheControlSession()
 
     def _urlnorm(self, uri):
         """Normalize the URL to create a safe key for the cache"""